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Error while data is saving: Undefined

URL of experiment:

Description of the problem:

I’ve had a couple of participants have issues when data is being saved at the end of the experiment. I tried running the experiment myself and got the same error.

Could this issue be related to the length of the data file that’s being saved? This experiment records each key press during a sentence typing task, so the excel file that’s being generated will be around 5000 rows long.